Spencer's advice is good. Some more advice:
1) Get ahold of a Le Nez du Cafe (full) set and study them, correlating the smells with what they are (supposed to be). Give special attention to those which are similar (honey, caramel, vanilla... rubber, medicinal, etc.).
2) Get an SCAA Defect handbook and study it. The defect test is open-book, but it helps to familiarize yourself with the defect classifications.
3) Read this: http://portafilter.net/?p=722
Good luck, and may the odds be ever in your favor!